在高溫高壓的水合熱裂條件下甲菲異構物已被證實可裂解生成菲，而部分異構物間也可以相互遷換，其中2-甲菲和9-甲菲間有相當高的互換比例。在先前假設的反應機制中，菲上的取代基是經由[1,5]的重排得到新的異構化產物，在文獻上，氫作[1,5]遷移的能力優於苯基，而苯基又優於甲基，因此在此一論文中我們主要的研究方向是將菲上的取代基，由甲基置換成苯基，比較2-苯菲和9-苯菲在水中的水合熱裂反應。實驗結果顯示9-苯菲在330oC、300oC以及280oC的溫度下反應三天，皆有2-苯菲的產物產生，而經由比較苯菲及甲菲的水合熱裂的結果可以發現，苯菲水合熱裂所生成的菲，明顯較甲菲少。

Hydrous pyrolysis of methylphenanthrenes under high temperature and high pressure condition has been proof to generate phenanthrene . In additon, an abnormal high isomerization ratio was observed in the cases of 2-methyl phenanthrene and 9-methylphenanthrene. In our previous proposed mechan icsm, substituted group on phenanthrene might undergo a [1,5] shift to rearran ge to their isomer. According to the literature report, [1,5] hydrogen shift is prior to [1,5] phenyl shift and in consequence [1,5] phenyl shift is prior to [1,5] methyl shift. Thus, in this syudy, hydrous pyrolysis of 2-phenylphenanthren e and 9-phenylphenanthrene were carried out. The results indicated that hydrous pyrolysis of 9-phenylphenanthrene at 330oC for 3 days has the highest transformation ratio between 9-phenylphenanthrene and 2-phenyl phenanthrene. On the other hand, another pyrolyzed product phenanthrene is decreased compare to that in methylphenanthrene.

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